Cisco CCDE 400-007 Questions & Answers

• Question 141:

  Refer to the table.

  

  A customer investigates connectivity options for a DCI between two production data centers to aid a large-scale migration project. The solution must provide a single 10G connection between locations and be able to run its own varying QoS profiles without service provider interaction based on the migration stages. All connectivity methods are at 10 Gbps. Which transport technology costs the least if the connectivity is required for just one year?

  A. MPLS wires only

  B. CWDM over dark fiber

  C. DWDM over dark fiber

  D. Metro Ethernet

  Correct Answer: B

  Note the requirement, "be able to run its own varying QoS profiles without service provider interaction based on the migration stages".

  Totals for each solution.

  dwdm 380000 cwdm 325000 mpls 215000 metro-e 350000

  At first glance MPLS is best, however QOS will need SP integration. Thus CWDM (D).

• Question 142:

  Refer to the exhibit.

  

  This network is running OSPF as the routing protocol. The internal networks are being advertised in OSPF London and Rome are using the direct link to reach each other although the transfer rates are better via Barcelona. Which OSPF design change allows OSPF to calculate the proper costs?

  A. Change the OSPF reference bandwidth to accommodate faster links.

  B. Filter the routes on the link between London and Rome

  C. Change the interface bandwidth on all the links.

  D. Implement OSPF summarisation to fix the issue

  Correct Answer: A

• Question 143:

  How can EIGRP topologies be designed to converge as fast as possible in the event of a point-to-point link failure?

  A. Limit the query domain by use of distribute lists.

  B. Build neighbor adjacencies in a triangulated fashion.

  C. Build neighbor adjacencies in squared fashion.

  D. Limit the query domain by use of summarization.

  E. Limit the query domain by use of default routes.

  Correct Answer: D

• Question 144:

  Company XYZ was not satisfied with the reconvergence time OSPF is taking. BFD was implemented to try to reduce the reconvergence time, but the network is still experiencing delays when having to reconverge. Which technology will improve the design?

  A. BFD echo

  B. Change the protocol to BGP

  C. Change the OSPF hello and dead intervals

  D. OSPF fast hellos

  Correct Answer: A

  with BFD echo, you can have more tighter timers, if we reducing OSPF timers would have achived the required convergence timer, customer would not have implemented BFD at first place.

• Question 145:

  Company XYZ Is running a redundant private WAN network using OSPF as the underlay protocol The current design accommodates for redundancy In the network, but it Is taking over 30 seconds for the network to reconverge upon failure.

  Which technique can be Implemented In the design to detect such a failure in a subsecond?

  A. STP

  B. fate sharing

  C. OSPF LFA

  D. BFD

  E. flex links

  Correct Answer: D

• Question 146:

  Refer to the exhibit.

  

  ACME Mining has four data centers in Santiago. Cape Town. Mumbai, and Beijing, full- mesh connected via a 400 Mb/s EVP-LAN They want to deploy a new mission-critical application with these requirements:

  1.

  cluster heartbeat 2 Mb/s continuous (250 KB/s)

  2.

  cluster heartbeat one-way maximum latency 100 ms

  These are the current ping tests results between the four data centers:

  

  Which hosting data center pair can host the new application?

  A. Mumbai and Beijing

  B. Santiago and Cape Town

  C. Santiago and Mumbai

  D. Cape Town and Mumbai

  E. Cape Town and Beijing

  F. Santiago and Beijing

  Correct Answer: D

• Question 147:

  Company XYZ is planning to deploy primary and secondary (disaster recovery) data center sites. Each of these sites will have redundant SAN fabrics and data protection is expected between the data center sites. The sites are 100 miles (160 km) apart and target RPO/RTO are 3 hrs and 24 hrs, respectively. Which two considerations must Company XYZ bear in mind when deploying replication in their scenario? (Choose two.)

  A. Target RPO/RTO requirements cannot be met due to the one-way delay introduced by the distance between sites.

  B. VSANs must be routed between sites to isolate fault domains and increase overall availability.

  C. Synchronous data replication must be used to meet the business requirements

  D. Asynchronous data replication should be used in this scenario to avoid performance impact in the primary site.

  E. VSANs must be extended from the primary to the secondary site to improve performance and availability.

  Correct Answer: BD

• Question 148:

  An architect prepares a network design for a startup company. The design must be able to meet business requirements while the business grows and divests due to rapidly changing markets. What is the highest priority in this design?

  A. The network should be hierarchical

  B. The network should be modular.

  C. The network should be scalable.

  D. The network should have a dedicated core.

  Correct Answer: B

  https://community.cisco.com/legacyfs/online/ccde_9781587144615_chapter1.pdf

  "Whereas with the modular design approach, if any given module faces an issue such as a security breach or the addition or removal of modules, there should be no need to redesign the network or introduce any effect to the other modules.

  Furthermore, breaking complex parts in the network based on a modular approach into manageable blocks will optimize the overall network manageability. In other words, from a network design point of view, modularity can promote design

  simplicity, flexibility, fault isolation, and scalability, as shown in Figure 1-7 [10]. At the same time, modularity reduces operational costs and complexities." The diagram shows modularity is the central point.

• Question 149:

  How many fully established neighbour relationships exist on an Ethernet with five routers running OSPF as network type broadcast?

  A. 5

  B. 6

  C. 7

  D. 10

  E. 20

  Correct Answer: C

  Assuming routers R1-R5, R1 is elected DR, R2 BDR. Fully established neighborships only occur to DR and BDR, all other neighbors are in 2Way DR other state. DR|BDRFull relationships: R2-R1 R3-R1 R3-R2 R4-R1 R4-R2 R5-R1 R5-R2

• Question 150:

  What statement describes the application layer as defined in the software-defined networking architecture?

  A. This layer is responsible for collecting the network status such as network usage and topology.

  B. This layer contains programs that communicate their desired network behavior to controllers.

  C. This layer is responsible for handling packets based on the rules provided by the controller.

  D. This layer processes the instructions and requirements sent by networking components.

  Correct Answer: B

  Reference: https://www.sunnyvalley.io/docs/network-basics/what-is-software-defined- networking-sdn